<template>
  <el-container class="home-container">
      <!-- 头部区域 -->
    <el-header>
        <div>
            <img src="../assets/hot.png" alt="">
            <span>电商后台管理系统</span>
        </div>
        <el-button type="info" @click="logout">退出</el-button>
    </el-header>
    <!-- 页面主体区域 -->
    <el-container>
        <!-- 侧边栏 -->
        <el-aside :width="isCollapse ? '64px':'200px'">
            <div class="toggle-button" @click="toggleCollapse">|||</div>
            <el-menu background-color="#333744" text-color="#fff" 
            active-text-color="#409eff" unique-opened :collapse="isCollapse" 
            :collapse-transition="false" router :default-active="activePath">
                <!-- 侧边栏菜单区域 -->
                <el-submenu :index="item.id + ''" v-for="item in menulist" :key="item.id">
                    <!-- 一级菜单的模板区域 -->
                    <template slot="title">
                        <!-- 图标 -->
                        <i :class="iconsObj[item.id]"></i>
                        <!-- 文本 -->
                        <span>{{item.authName}}</span>
                    </template>
                    
                    <!-- 二级菜单 -->
                    <el-menu-item :index="'/' + subItem.path" v-for="subItem in item.children" :key="subItem.id" @click="saveNavState('/' + subItem.path)">
                        <template slot="title">
                        <!-- 图标 -->
                        <i class="el-icon-menu"></i>
                        <!-- 文本 -->
                        <span>{{subItem.authName}}</span>
                    </template>
                    </el-menu-item>
                </el-submenu>
            </el-menu>
        </el-aside>
      <!-- 右侧内容主体 -->
      <el-main>
          <!-- 路由占位符 -->
          <router-view></router-view>
      </el-main>
    </el-container>
  </el-container>
</template>

<script>
export default {
    data(){
        return{
            //左侧菜单数据
            menulist:[],
            iconsObj:{
                '125':'iconfont icon-user',
                '103':'iconfont icon-tijikongjian',
                '101':'iconfont icon-shangpin',
                '102':'iconfont icon-danju',
                '145':'iconfont icon-baobiao'
            },
            //是否折叠
            isCollapse:false,
            //被激活的链接地址
            activePath:''
        }
    },
    created(){
        this.getMenuList()
        this.activePath = window.sessionStorage.getItem('activePath')
    },
    methods: {
        logout() {
            window.sessionStorage.clear();
            this.$router.push("/login");
    },
    //获取所有的菜单
    async getMenuList(){
        const { data: res } = await this.$http.get('menus')
        if(res.meta.status !==200) return this.$message.error(res.meta.msg)
        this.menulist=res.data
        console.log(res);
    },
    //点击按钮，切换菜单的折叠与展开
    toggleCollapse(){
        this.isCollapse = !this.isCollapse        
    },
    //保存链接的激活状态
    saveNavState(activePath){
        window.sessionStorage.setItem('activePath',activePath)
        this.activePath = activePath
    }
  },
};
</script>

<style lang="less" scoped>
    .home-container{
        height: 100%;   
    }
    .el-header {
        background-color: #373d41;
        display: flex;
        justify-content: space-between;
        padding-left: 0;
        align-items: center;
        color: #fff;
        font-size: 20px;
        > div{
            display: flex;
            align-items: center;
            span{
                margin-left: 15px;
            }
        }
    }
    .el-aside {
        background-color: #333744;
        .el-menu{
            border-right: none;
        }
    }
    .el-main{
        background-color: #eaedf1;
    }
    .iconfont{
        margin-right: 10px;
    }
    .toggle-button{
        background-color: #4a5064;
        font-size: 10px;
        line-height: 24px;
        color: #fff;
        text-align: center;
        letter-spacing: 0.2em;
        cursor: pointer;
    }
</style>